Bunsen burners



BUNSEN BURNERS 2 Sheets-Sheet 2 Filed arch 21. 1952 United States Patent O BUNSEN BURNERS Hans Dnges and Fritz Knig, Remscheid, Germany, assignors to Joh. Vaillant, K. G., Remscheid, Germany Application March 21, 1952, Serial No. 277,777

2 Claims. (Cl. 158-106) This invention relates to that known type of Bunsenburners and in particular to propane-gas bur-ners for gas water heaters with which vertical mixing pipes, provided with air entrance orivces, are mounted upon horizontal distributor pipes, provided with gas emission jets. Such burners, especially suitable for propane-gas, butane-gas, or similar liquefied fuels, are used preferably for gas water heaters. The constructional set-up of such burners in the hitherto employed manner is comparatively complicated, so that their production is expensive and troublesome. For attachment of the mixing pipes to the distributor pipes, up to this time, special joint parts have been used which at the same time formed the gas emission jets. The purpose of this invention is to realize an essential simplification, and with it a cheaper manufacturing of the bur-ner by a special construction and attachment of the mixing pipes by which the hitherto necessary joint parts will be omitted.

Furthermore however, an essential improvement of the burning attributes, in particular with respect to the primary air supply, is achieved by the invention, whereby in addition the application of an especially advantageous burner head is rendered possible. The improvement of the burning attributes is characterized by the fact that propane-gas and butane-gas as well can be used for burning, resulting in the same burning efficiency, while up to this time different types of burners were used for these two types of gas.

An essential idea of the invention is that the lower ends of the mixing pipes are provided with horizontally -aligned holes through which the distributor pipe extends. This arrangement makes it possible that the air entrance orifices of the mixing pipe can be shaped and arranged more appropriately than up to now. In the hitherto employed manner, a circumferentially spaced series of holes for the air entrance was provided at the mixing pipe above the position of the gas emission jet, located in the distributor pipe. Instead of this, the invention provides two air entrance orifices opposite each other and in triangular basic form which have been made by milling. These orifices form an essentially bigger cross section of air entrance than a series of holes, because the milled orifices can be made so large that the upper part of the mixing pipe is only held by two narrow bridges. First of all, owing to the nature of the structure of the burner in accordance with the invention, it is possible to arrange the triangular air entrance orifices at both sides parallel to the distributor pipe at such a height that the position of the gas jet is nearly in the middle of the air entrance orifice. It is evident that with this arrangement the conditions for sucking the primary air have been decisively improved, because the air can enter the mixing pipe with the gas stream smoothly sloping from below. This manner of primary air supplypermits reduction of the height of the mixing pipe, by which not only material is saved, but also the overall size of the entire set is reduced accordingly.

v 2,799,330 Patented July 16, 1957 ice The improved primary air supply allows first of all the use -of an extremely advantageous and at the same time simple and cheap to be manufactured burner head with a large emission cross-section. The goal to be aimed at is to get the broadest possible burning fiame at each mixing pipe, in order to v fill out a larger plane, for example a heating chamber cross section of substantially continuous liame by employing the smallest possible numberl of mixing tubes. With a gas-air-mixture with sufficient primary air, this problem can be solved by providing at the burner head of the mixing pipe, an inverted cupshaped Wire gauze element, which is put over the end of the mixing pipe in that manner that the gas-air-mixture mainly leaves at the cylindrical circumference of the cupshaped body. A turbulence of the gas-air-mixture takes v. place at the different wires of the wire gauze body, and

- can be screwed into this thread.

by this an intensive mixing is achieved which can be still more intensified by mounting a batiie plate for elimination of the gas-air-mixture emission at the center of the cup-shaped'body. 4

The invention and further advantageous details of its application are particularized in the following by way of anexample as represented in the accompanying drawings wherein: l:

Fig. 1r shows in diagrammatical representation a per-` spective view of the entire burner.

Fig. 2 represents a vertical cross-section of the mixing pipe and of the distributor pipe.

Fig. 3 is a side view, partly in section, showing one of the mixing pipes on a distributor pipe.

Fig. 4 is an elevational view showing the arrangement of a mixing pipe upon a distributor pipe.

Fig. 5 is a perspective view of a burner head.

The burner consists of a burner pipe 2 to be connected with the gas supply pipe by means of a union 1, and of several distributor pipes 3, 3', 3, each of which carries several mixing pipes 4, 4',4 The mixing pipe 4, as especially can be recognized at Fig. 2, is closed at its bottom end, and it is, as is indicated by dash-dot lines, formed from a section of pipe by means of a rotating tool. An increase in thickness of material results from this non-cutting shaping, so that there a thread can be cut and a screw 5 for fastening of the mixing pipe 4 In the same manner the original cylindrical end of the distributor pipe 3 is closed hemispherically, whereby--as experience has proved-a durable gas proof termination can be obtained at the seam 6. The mixing pipe 4 is fitted with cross drillings 7, 7', which conform in size andv shape to the outside -of the distributor pipe and permit the mixing pipe to be pushed sideways onto the distributor pipe 3 before the screw 5 is screwed in. The screw 5 extends through the distributor pipe 3 and projects just above it jet 8. A jet passageway extends from the end of jet 8 downwardly in the combined screw fastening and gas jet element and opens at a lateral surface thereof within the distributor pipe, as by connecting with a cross drilling 9 of the screw 5. The jet 8 can easily be cleaned by unscrewing the screw 5. In Figs. 3 and 4 it can be recognized that the mixing pipe 4 is cut open at both sides, parallel to the distributor pipe 3 and at the height of same, thus forming big air entrance orifices 10, 10 of triangular basic form. The jet 8 is placed nearly in the middle of the air entrance orifices 10, 10', so that the primary air is smoothly drawn from below.

At the head of the mixing pipe 4 a pocket shaped ring 11 is provided, into which the rim of an inverted cupshaped body 12 made of Wire gauze is inserted. At the center of the body 12 a bafiie plate 13 is mounted to cause the gas mixture to leave only at the cylindrical circumferenoe of the wire gauze body 12. Fastening of the ring 11 and of the there inserted wire gauze body 12 is done by impressions 11 provided in the ring 11, by which the ring 11 and at the same time the wire gauze body 12 are pressed into an annular slot 14, grooved into the mixing pipe 4.

It is possible, as represented in Fig. 5, also torcover different zones of the wire gauze body 12, thus limiting the gas supply channels, whereby the secondary air supply can better reach the burner head. Such a covering of the gas mixture exit surface can be realized for example, by a crossed tape 15 stretching over the wire gauze vbody 12.

What is claimed is:

l. In a Bunsen burner including a horizontal gas distributor pipe adapted to be connected with ya gas supply pipe, a vertical mixing pipe Vmounted upon and supported by said distributor pipe, said mixing pipe zbeing closed at its bottom end and having horizontally aligned holes through opposite side walls near vthe closed bottom end thereof through which holes said distributor 4pipe extends, said holes conforming in size and shape to the outside size `and shape of said distributor pipe, said mixing pipe having a threaded opening in the center of the closed bottom end thereof, said distributor pipe having vertically aligned holes through opposite side walls thereof at the axis of said mixing pipe, and a combined unitary screw fastening and gas jet element threadedly engaging said threaded opening in the closed bottom end of said mixing pipe and extending through said holes in said distributor pipe and terminating in the lower portion of the mixing pipe just above said distributor pipe, said velement closely fitting into one of said holes in said distributor pipe to hold said mixing pipe in position upon said distributor pipe, the upper end portion of said element having a gas jet passageway opening at the end of said element and extending axially downwardly and opening at a lateral surface of said element within said distributor pipe, said mixing pipe having air inlet openings near the bottom end thereof.

2. Structure in accordance with claim l wherein the air inlet openings consist of two openings opposite each other and laterally disposed with respect to the distributor pipe at approximately the level of the top of the gas jet element, each said opening being widest at the top and becoming progressively narrower toward its bottom, said openings extending circumferentially around the greater part of the mixing pipe to leave only narrow sections thereof supporting the portion of the mixing pipe above said air inlet openings.

References Cited in the le lof this patent UNITED STATES PATENTS 1,342,617 Barber June 8, 1920 FOREIGN PATENTS 975,597 France Oct. l7, 1950 

